Analysis of Variance
 Firstly the column of response values is specified.
 Secondly the column indicating ``treatments'' is specified.
 Another column indicating ``blocks'' is selected.
Various statistics in the AOV table for randomized block design are described as in the following.
Source  Degree of freedom  Mean square  Fstatistic  
Treatment  
Block  
Error 


Total within blocks 
 is called the treatment sample mean for each treatment .
 is the block sample mean for each block .
 is the overall sample mean.
 is the treatment sum of sqaures.
 is the block sum of sqaures,
 is the error sum of sqaures.

is the total sum of sqaures.
Together we obtain the algebraic identity
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